Insulation plug of elbow type cable joint with temperature measurement function

Abstract

The invention discloses an insulating plug of an elbow-type cable joint with a temperature measurement function, and relates to the technical field of cable joints, the insulating plug comprises an insulating shell connected with the elbow-type cable joint and an insulating plug assembly connected in the insulating shell, a metal piece is installed in the insulating shell, and a circuit board is conductively connected with the metal piece. The temperature measuring element measures temperature data in the elbow-type cable joint and outputs the temperature data through the data output module; the metal shielding cover covers the metal piece and the circuit board, and a suspension capacitor formed between the metal shielding cover and the metal piece generates a potential difference in an alternating electric field and can spontaneously supply power to the circuit board; the dielectric layer is arranged between the metal piece and the metal shielding cover. The temperature measuring element is arranged in the insulating plug, and the metal shielding cover and the metal piece form a capacitor to supply power to the temperature measuring element, so that the temperature in the cable can be accurately measured, potential faults of cable accessories can be conveniently found in time, and the safety and stability of power grid operation are improved.

Description

Technical Field

[0001] The invention relates to the technical field of cable joints, and in particular to an insulating plug of an elbow-type cable joint with a temperature measuring function. Background Art

[0002] With the improvement of urban construction, all kinds of cables are required to go through underground passages, so more and more distribution network power supply lines are powered by cables. As the utilization rate of cables increases, the number of cable faults is also increasing, and cable faults will directly affect the power supply of users and bring great social impact. One-third of the cable faults are caused by quality problems of cable accessories.

[0003] The quality problems of cable accessories mainly include insulation problems and poor contact problems. However, these problems are caused by the gradual heating of the installation part of the cable accessories and the gradual destruction of insulation. If the temperature changes inside the cable accessories can be monitored in time, it will help to timely discover the hidden faults of the cable accessories and improve the safe operation level of the power grid.

[0004] However, the internal space of cable accessories is very small, and the appearance of metal is extremely demanding. It cannot produce additional tip discharge or electric field distortion to damage the internal insulation. At present, infrared thermal imagers are generally used to observe the external temperature changes. Some power departments also use temperature sensors arranged on the outer shell of cable accessories to collect the temperature changes of the outer shell of cable accessories in real time. However, the actual effect of detecting the operating temperature of cable accessories by thermal imagers or arranging temperature sensors on the outside of cable accessories is very poor. The reasons are: first, most operating equipment has cabinet doors for sealing and electric locks. The cabinet doors cannot be opened when powered, making the thermal imager unusable; second, all cable accessories use silicone rubber as insulation material with a thickness of 1-2cm. Silicone rubber is a good thermal insulation material, so the heat generated inside cannot be conducted to the outside. The external temperature monitored by the thermal imager or temperature sensor is very different from the actual internal temperature.

[0005] Therefore, traditional technical means cannot accurately monitor the temperature changes inside the cable accessories, and thus cannot promptly discover potential faults in the cable accessories, resulting in low safety and stability in the operation of the power grid. Summary of the invention

[0006] The purpose of the present invention is to provide an insulating plug of an elbow-type cable connector with a temperature measuring function. By arranging a temperature measuring unit inside the insulating plug, the temperature inside the cable can be measured more accurately, which is convenient for timely discovery of hidden faults of cable accessories, improves the safety and stability of power grid operation, and solves the above-mentioned problems existing in the prior art.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] The present invention discloses an insulating plug of an elbow-type cable connector with a temperature measuring function, comprising an insulating shell connected to the elbow-type cable connector and an insulating plug assembly connected to the insulating shell, wherein the insulating plug assembly comprises a metal part, a circuit board, a metal shielding cover and a dielectric layer, wherein the metal part is installed in the insulating shell, the circuit board is conductively connected to the metal part, the circuit board comprises a temperature measuring element and a data output module, the temperature data inside the elbow-type cable connector is measured by the temperature measuring element and the temperature data is output through the data output module; the metal shielding cover is arranged outside the metal part and the circuit board, and the suspended capacitor formed between the metal shielding cover and the metal part generates a potential difference in an alternating electric field, and can spontaneously supply power to the circuit board; the dielectric layer is arranged between the metal part and the metal shielding cover, and is used to separate the metal part and the metal shielding cover and can affect the capacity of the suspended capacitor, and the dielectric layer comprises an insulating inner sleeve sleeved with one end of the metal part, and the insulating inner sleeve abuts against the metal shielding cover.

[0009] By adopting the above technical scheme, the insulating plug assembly is arranged inside the insulating shell, and the insulating shell is installed inside the elbow-type cable connector, so the temperature measuring element and the data output module arranged on the circuit board are located inside the elbow-type cable connector, which can more accurately detect the temperature inside the cable connector and output the temperature data through the data output module, so that the staff can find the hidden faults of the cable accessories in time and improve the safety and stability of the power grid operation; at the same time, since the internal space of the cable plug is small, it is not suitable to install a power supply for powering the circuit board inside it, considering that the elbow-type cable connector will generate an alternating electric field during operation, the suspended capacitor formed between the metal part and the metal shielding cover will generate a potential difference in the alternating electric field, which can spontaneously power the circuit board; the setting of the dielectric layer can affect the capacity of the suspended capacitor, and at the same time can also avoid direct contact between the metal shielding cover and the metal part, affecting the storage of electricity.

[0010] By adopting the above technical solution, an insulating inner sleeve is arranged between the metal part and the metal shielding cover, which increases the dielectric coefficient between the two, increases the storage capacity of the capacitor, and makes it difficult for the two to be broken down; at the same time, it also facilitates the installation between the metal shielding cover and the metal part.

[0011] Furthermore, the dielectric layer also includes an insulating soft rubber layer covering the metal component and the circuit board, and the insulating soft rubber layer abuts against the metal shielding cover.

[0012] By adopting the above technical solution, an insulating inner sleeve and an insulating soft rubber layer are arranged between the metal part and the metal shielding cover, which increases the dielectric coefficient between the two, increases the storage capacity of the capacitor, and makes it difficult for the two to be broken down; at the same time, it also facilitates the installation between the metal shielding cover and the metal part.

[0013] Furthermore, the insulating inner sleeve is made of rubber, and the insulating soft rubber layer is made of epoxy resin.

[0014] Furthermore, the metal component includes a main metal rod and a metal supporting component arranged at one end of the main metal rod, and the circuit board is sleeved outside the main metal rod and fixedly and conductively connected to the metal supporting component.

[0015] By adopting the above technical solution, the installation of the circuit board and the metal part is facilitated, and the electrical connection between the circuit board and the metal part is also facilitated.

[0016] Furthermore, the metal supporting member is symmetrically provided with a fixing groove and a conductive groove on one side close to the circuit board, and the circuit board is provided with a fixing hole and a conductive hole corresponding to the fixing groove and the conductive groove respectively, the first fixing member passes through the fixing hole and is connected to the fixing groove, the second fixing member passes through the conductive hole and is connected to the conductive groove, and the second fixing member is a conductor.

[0017] By adopting the above technical solution, the first fixing member and the second fixing member can fix the circuit board on the metal supporting member; while fixing the circuit board, the second fixing member can be used to transmit the voltage on the metal member to the circuit board to power the components on the circuit board, and the connection method is simple and convenient.

[0018] Furthermore, the main metal rod and the metal supporting member are both cylindrical and coaxially arranged, and the diameter of the metal supporting member is larger than the diameter of the main metal rod. The circuit board is annular and matches the shape of the metal supporting member.

[0019] Furthermore, an insulating gasket is provided between the metal supporting member and the circuit board.

[0020] By adopting the above technical solution, the short circuit phenomenon caused by direct contact between the circuit board and the metal supporting member can be avoided, thereby extending the practical life of the circuit board.

[0021] Furthermore, a semiconductor insulating material layer is evenly coated on the outside of the metal shielding cover, and the semiconductor insulating material layer is covered on the outside of the main metal rod and wraps the circuit board, the dielectric layer and the insulating gasket, so that the metal shielding cover can have a larger area to form a suspended capacitor with the main metal rod, thereby increasing the capacity of the suspended capacitor.

[0022] By adopting the above technical solution, since the metal shielding cover will form suspended discharge after being put into operation, resulting in extremely high partial discharge, long-term operation will damage the internal insulation of the cable and cause failures. The provision of the semiconductor insulating material layer can avoid the generation of a large amount of partial discharge, thereby achieving the purpose of protecting the internal insulation of the cable and extending the overall service life.

[0023] By adopting the above technical solution, the connection strength between the insulating shell and the insulating plug assembly can be improved.

[0024] Furthermore, an external thread is provided on the outer peripheral surface of the metal supporting member, a receiving groove for accommodating the insulating plug assembly is provided in the insulating shell, and an internal thread connected to the external thread is provided at the notch of the receiving groove, and a through groove is provided on the end surface of the metal supporting member away from the main metal rod.

[0025] By adopting the above technical solution, when the insulating plug assembly is placed in the insulating shell, the external thread on the metal support is connected with the internal thread in the insulating shell, so that the insulating plug assembly can be connected in the insulating shell. In terms of the overall production process of the insulating plug, the insulating plug assembly and the insulating shell are connected by threads, so that the interaction force between the insulating shell and the insulating plug assembly is not large. During the installation process of the two, it is not easy to damage the components in the insulating plug assembly, thereby improving the yield of the cable plug. In addition, the provision of the through groove makes it easy for the staff to use tools to screw the metal support into the inside of the insulating shell, thereby facilitating the installation of the insulating plug assembly.

[0026] Furthermore, insulating glue is coated on the connection between the external thread and the internal thread and inside the receiving groove.

[0027] By adopting the above technical solution, the connection strength between the insulating plug assembly and the insulating shell can be improved, and the two are not easy to separate.

[0028] Compared with the prior art, the beneficial technical effects of the present invention are:

[0029] The insulating plug of the elbow-type cable connector with temperature measuring function of the present invention can measure the temperature inside the cable more accurately by arranging a temperature measuring element inside the insulating plug, the metal shielding cover and the metal part form a suspended capacitor, and form a potential difference in the alternating electric field formed inside the elbow-type cable connector to power the temperature measuring element, so as to facilitate the staff to timely discover the hidden dangers of the elbow-type cable connector and improve the safety and stability of the power grid operation; and the circuit board is fixedly connected to the metal supporting part through the first fixing part and the second fixing part, and conducts electricity through the second fixing part to directly power the circuit board, and the structural design is compact and easy to use; wherein, the metal shielding cover is directly covered outside the main metal rod, which can increase the relative area with the metal part and improve the capacity of the capacitor; a semiconductor insulating material layer is evenly applied outside the metal shielding cover, and the arrangement of the semiconductor insulating material layer can avoid the generation of a large amount of partial discharge, so as to achieve the purpose of protecting the internal insulation of the cable and prolong the overall service life; at the same time, the insulating plug assembly and the insulating shell are threadedly connected and then bonded with insulating glue, which can reduce the interaction force between the insulating plug assembly and the insulating shell, reduce the probability of damage to the internal parts of the insulating plug assembly, and improve the yield rate of the cable plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a structural schematic diagram of an elbow-type cable connector with an insulating plug of an elbow-type cable connector with a temperature measuring function of the present invention;

[0032] Figure 2 It is a three-dimensional structural schematic diagram of the insulating plug of the elbow-type cable connector with temperature measuring function of the present invention;

[0033] Figure 3 for Figure 2 Schematic diagram of explosion cross section;

[0034] Figure 4 It is a three-dimensional exploded schematic diagram of another embodiment of the insulating plug of the elbow-type cable connector with temperature measurement function of the present invention;

[0035] Figure 5 for Figure 4 Schematic diagram of the cross section after the insulating plug is assembled.

[0036] Figure numerals: 100, insulating shell; 111, accommodating groove; 112, internal thread; 200, insulating plug assembly; 210, metal part; 211, main metal rod; 212, metal supporting part; 213, fixing groove; 214, conductive groove; 215, groove; 216, external thread; 217, through groove; 220, circuit board; 221, fixing hole; 222, conductive hole; 223, first fixing part; 224, second fixing part; 225, temperature measuring element; 230, insulating soft rubber layer; 240, metal shielding cover; 250, insulating inner sleeve; 260, insulating gasket; 270, semiconductor insulating material layer; 280, dielectric layer; 300, insulating plug; 400, elbow-type cable connector; 500, cable; 600, crimping terminal; 700, arc-extinguishing conductive rod. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "length", "width", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0041] Reference Figure 1 When an external device is connected to a high-voltage device, an elbow-type cable connector 400 is often used. An insulating plug 300 is generally installed at one end of the elbow-type cable connector 400, and the cable 500 is connected to the insulating plug 300 through a crimping terminal 600. When the elbow-type cable connector 400 is energized, an alternating electric field is generated inside it, and the insulating plug 300 also has an alternating electric field inside.

[0042] Based on the above structure, refer to Figure 2 The insulating plug 300 of the elbow-type cable connector 400 with temperature measurement function according to the embodiment of the present invention includes an insulating shell 100 fixedly connected to one end of the elbow-type cable connector 400 , and an insulating plug assembly 200 connected to the insulating shell 100 .

[0043] Reference Figure 3The insulating plug assembly 200 includes a metal part 210, a circuit board 220, a dielectric layer, and a metal shielding cover 240. The metal part 210 includes a main metal rod 211 and a metal support part 212 integrally formed and arranged at one end of the main metal rod 211. The main metal rod 211 and the metal support part 212 are both cylindrical and coaxially arranged, and the diameter of the metal support part 212 is greater than the diameter of the main metal rod 211. The metal support part 212 is connected to the inside of the main metal rod 211 and is provided with a stepped groove 215. The arc-extinguishing conductive rod 700 arranged in the elbow-type cable connector 400 is connected in the groove 215 (see Figure 1 ), which is electrically connected to the metal rod 210.

[0044] Preferably, the circuit board 220 is in a circular ring shape and matches the shape of the metal support 212. In addition, the metal support 212 is symmetrically provided with a fixing slot 213 and a conductive slot 214 near the circuit board 220, and the circuit board 220 is provided with a fixing hole 221 and a conductive hole 222 corresponding to the fixing slot 213 and the conductive slot 214, respectively. The first fixing member 223 passes through the fixing hole 221 and is connected to the fixing slot 213, and the second fixing member 224 passes through the conductive hole 222 and is connected to the conductive slot 214.

[0045] In this embodiment, the first fixing member 223 and the second fixing member 224 are both conductive screws. In addition, a conductive layer such as a tin layer is provided around the conductive hole 222, and the conductive layer is conductively connected to the voltage input terminal on the circuit board 220. When the conductive screw is connected to the metal support member 212, the other end of the conductive screw is connected to the conductive layer to realize the function of supplying power from the metal support member 212, and also to realize the fixing of the position of the circuit board 220. At the same time, the lead wire on the circuit board 220 is connected to the metal shielding cover 240, forming a path to supply power to the components on the circuit board 220.

[0046] In addition, refer to Figure 5 The circuit board 220 is provided with a temperature measuring element 225 such as a thermal resistor, an MCU electrically connected to the thermal resistor, and a data output module electrically connected to the MCU. When the circuit board 220 is powered on, the temperature data inside the elbow-type cable connector 400 measured by the thermal resistor is input into the MCU. After being analyzed and processed by the MCU, the data is output through the data output module. In this embodiment, the data output module adopts a wireless transmission module, and correspondingly, a device terminal with a wireless receiving module corresponding to the wireless transmission module is provided at the staff, such as a smart phone, a tablet computer, a computer, etc. Through the data exchange between the wireless transmission module and the wireless receiving module, the staff can monitor the temperature inside the elbow-type cable connector 400 in real time, so as to timely discover the hidden dangers of cable accessories and improve the safety and stability of power grid operation.

[0047] In addition, an insulating gasket 260 such as a rubber gasket is disposed between the metal supporting member 212 and the circuit board 220 to prevent other components on the circuit board 220 from directly contacting the metal supporting member 212 and causing a short circuit.

[0048] Among them, a dielectric layer 280 is sleeved on the main metal rod 211 away from the metal supporting member 212. In one embodiment, the dielectric layer 280 adopts an insulating inner sleeve 250 made of rubber. The insulating inner sleeve 250 is set on one end of the main metal rod 211 and abuts against the metal shielding cover 240. In another embodiment, the dielectric layer 280 includes an insulating inner sleeve 250 sleeved on one end of the main metal rod 211, and an insulating soft rubber layer 230 covering the main metal rod 211 and the circuit board 220. The insulating inner sleeve 250 and the insulating soft rubber layer 230 are both abutted against the metal shielding cover 240, which can change the dielectric coefficient of the suspended capacitor and the capacity of the suspended capacitor, and also facilitate the connection of the metal shielding cover 240 to the outside of the main metal rod 211. Preferably, the insulating soft rubber layer 230 is made of epoxy resin.

[0049] A semiconductor insulating material layer 270 is applied on the outside of the metal shield 240, and the metal shield 240 is coated on the inner wall of the semiconductor insulating material layer 270. A metal coating such as copper is evenly sprayed on the inner wall of the semiconductor insulating material layer 270 by a spraying method. The provision of the semiconductor insulating material layer 270 can avoid the generation of a large amount of partial discharge and damage to the internal insulation of the cable. The semiconductor insulating material layer 270 is provided outside the main metal rod 211 and wraps the insulating gasket 260, the circuit board 220, the insulating soft rubber layer 230 and the insulating inner sleeve 250, so that the metal shield 240 can have a larger area to form a suspended capacitor with the main metal rod 211, which can increase the capacity of the suspended capacitor.

[0050] In this embodiment, the insulating housing 100 is cast and formed outside the insulating plug assembly 200, and a receiving groove 111 is formed inside the insulating housing 100. In addition, in order to increase the connection area with the insulating housing 100 and improve the connection strength between the insulating housing 100 and the insulating plug assembly 200, annular patterns are uniformly formed on the outer circumference of the metal support 212, and patterns matching the annular patterns are formed at the notch of the receiving groove 111.

[0051] In another embodiment, considering that the pressure acting on the insulating plug assembly 200 during casting of the insulating housing 100 is too large, it is easy to crush the components inside the insulating plug assembly 200, resulting in a high scrap rate of the cable plug 300, so the insulating housing 100 and the insulating plug assembly 200 are arranged in an assembled manner. Figure 4 and Figure 5The insulating housing 100 has a receiving groove 111, and the notch of the receiving groove 111 is provided with an internal thread 112. The size of the metal support 212 is adapted to the notch of the receiving groove 111, and an external thread 216 connected to the internal thread 112 is provided on the outer peripheral surface of the metal support 212. One end of the main metal rod 211 is installed inside the receiving groove 111, and a through groove 217 is provided on the end surface of the metal support 212 away from the main metal rod 211, so that the staff can use tools to screw the insulating plug assembly 200 into the receiving groove 111. It should be noted that the connection between the external thread 216 and the internal thread 112 and the receiving groove 111 are coated with insulating glue. Before installation, the staff can first apply insulating glue on the wall of the accommodating groove 111 and the internal thread 112; or first apply insulating glue on the wall of the accommodating groove 111, and then apply insulating glue on the connection between the external thread 216 and the internal thread 112 after the insulating plug assembly 200 is screwed and installed in the accommodating groove 111.

[0052] The working principle of this embodiment is as follows: the metal support member 212 is installed in the receiving groove 111. When the elbow-type cable connector 400 is in the power-on state, an alternating electric field is generated inside it, and a potential difference is formed between the suspended capacitor formed by the metal member 210 and the metal shielding cover 240, which supplies power to the load on the circuit board 220. At this time, the thermal resistor transmits the detected temperature data to the MCU, which is processed by the MCU and then transmitted to the outside through the wireless transmission module for real-time monitoring, so that the staff can find the hidden dangers of the elbow-type cable connector 400 in time and improve the safety and stability of the power grid operation.

[0053] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An insulating plug for an elbow-type cable connector with a temperature measuring function, characterized in that: The invention comprises an insulating shell (100) connected to an elbow-type cable connector and an insulating plug assembly (200) connected to the insulating shell (100), wherein the insulating plug assembly (200) comprises a metal part (210), a circuit board (220), a metal shielding cover (240) and a dielectric layer (280), wherein the metal part (210) is installed in the insulating shell (100), the circuit board (220) is conductively connected to the metal part (210), and the circuit board (220) comprises a temperature measuring element and a data output module, wherein the temperature measuring element measures the temperature data inside the elbow-type cable connector (400) and outputs the temperature data through the data output module; the metal shielding cover The (240) cover is arranged outside the metal part (210) and the circuit board (220), and the suspended capacitor formed between the metal shielding cover and the metal part (210) generates a potential difference in the alternating electric field, and can spontaneously supply power to the circuit board (220); the dielectric layer (280) is arranged between the metal part (210) and the metal shielding cover (240), and is used to separate the metal part (210) and the metal shielding cover (240) and can affect the capacity of the suspended capacitor, and the dielectric layer (280) includes an insulating inner sleeve (250) sleeved with one end of the metal part (210), and the insulating inner sleeve (250) is abutted against the metal shielding cover (240).

2. The insulating plug of the elbow-type cable connector with temperature measurement function according to claim 1 is characterized in that: The dielectric layer (280) further comprises an insulating soft rubber layer (230) coated on the outside of the metal part (210) and the circuit board (220), and the insulating soft rubber layer (230) is in contact with the metal shielding cover (240).

3. The insulating plug of the elbow-type cable connector with temperature measurement function according to claim 2 is characterized in that: The insulating inner sleeve (250) is made of rubber, and the insulating soft rubber layer (230) is made of epoxy resin.

4. The insulating plug of the elbow-type cable connector with temperature measurement function according to claim 1, characterized in that: The metal component (210) comprises a main metal rod (211) and a metal supporting component (212) arranged at one end of the main metal rod (211); the circuit board (220) is sleeved outside the main metal rod (211) and is fixedly and conductively connected to the metal supporting component (212).

5. The insulating plug of the elbow-type cable connector with temperature measurement function according to claim 4, characterized in that: The metal supporting member (212) is symmetrically provided with a fixing groove (213) and a conductive groove (214) on one side close to the circuit board (220); the circuit board (220) is provided with a fixing hole (221) and a conductive hole (222) respectively corresponding to the fixing groove (213) and the conductive groove (214); the first fixing member (223) passes through the fixing hole (221) and is connected to the fixing groove (213); the second fixing member (224) passes through the conductive hole (222) and is connected to the conductive groove (214); and the second fixing member (224) is a conductor.

6. The insulating plug of the elbow-type cable connector with temperature measurement function according to claim 4, characterized in that: The main metal rod (211) and the metal supporting member (212) are both cylindrical and coaxially arranged, and the diameter of the metal supporting member (212) is larger than the diameter of the main metal rod (211). The circuit board (220) is annular and matches the shape of the metal supporting member (212).

7. The insulating plug of the elbow-type cable connector with temperature measurement function according to claim 4, characterized in that: An insulating gasket (260) is provided between the metal supporting member (212) and the circuit board (220).

8. The insulating plug of the elbow-type cable connector with temperature measurement function according to claim 7, characterized in that: A semiconductor insulating material layer (270) is evenly coated on the outside of the metal shielding cover (240), and the semiconductor insulating material layer (270) is arranged outside the main metal rod (211) and wraps the circuit board (220), the dielectric layer (280) and the insulating gasket (260), so that the metal shielding cover (240) can have a larger area to form a suspended capacitor with the main metal rod (211), thereby increasing the capacity of the suspended capacitor.

9. The insulating plug of the elbow-type cable connector with temperature measurement function according to any one of claims 4 to 8, characterized in that: The outer circumferential surface of the metal support member (212) is provided with an external thread (216); a receiving groove (111) for receiving the insulating plug assembly (200) is provided in the insulating housing (100); an internal thread (112) connected to the external thread (216) is provided at the notch of the receiving groove (111); and a through groove (217) is provided on an end surface of the metal support member (212) away from the main metal rod (211).

10. The insulating plug of the elbow-type cable connector with temperature measurement function according to claim 9, characterized in that: Insulating glue is applied to the connection between the external thread (216) and the internal thread (112) and inside the receiving groove (111).

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